Pre-release: Update version to 0.18.0 (#792)

This PR updates the version to 0.18.0.

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---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Steve Liu <liustve@amazon.com>

Author: 3 people

CHANGELOG.md

@@ -12,6 +12,8 @@ If your change does not need a CHANGELOG entry, add the "skip changelog" label t
 
 ## Unreleased
 
+## v0.18.0 - 2026-06-18
+
 - feat: support pluggable session injection for the OTLP HTTP exporter via the upstream OTel SDK hook
   ([#794](https://github.com/aws-observability/aws-otel-python-instrumentation/pull/794))
 - Nightly dependency update: OpenTelemetry 1.42.1/0.63b1

aws-opentelemetry-distro/src/amazon/opentelemetry/distro/version.py

@@ -1,4 +1,4 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-__version__ = "0.17.1.dev0"
+__version__ = "0.18.0"